蔬菜中腐霉利、克百威、对硫磷的检测能力验证样品研制及应用

Preparation and application of the proficiency testing of procymidone,carbofuran,and parathion in vegetables

目的制备更贴近实际样品且均匀性和稳定性良好的能力验证样品,并通过能力验证项目分析全国实验室检测蔬菜中腐霉利、克百威、对硫磷的能力。方法能力验证样品采用市售蔬菜汁添加目标物标准溶液的方式制备,并进行均匀性检验和稳定性检验;采用稳健统计得到指定值和能力评定标准差,利用z值对各参加实验室提交的结果进行评价。结果所制备的样品经均匀性和稳定性检验样品符合能力验证要求;将所研制的样品应用于能力验证,全国共有94家实验室参加,其中参加腐霉利项目的实验室满意率为84.5%;参加克百威项目的实验室满意率为83.3%;参加对硫磷项目的实验室满意率为89.6%。结论采用本研究中的制备方式制得的样品具有良好的均匀性和稳定性,能够满足能力验证样品的要求;能力验证统计结果表明,参加实验室的蔬菜中腐霉利、克百威、对硫磷的检测能力总体较好。通过本次能力验证活动对该领域实验室的检测水平有了一定了解,达到预期的效果。

Objective This study aimed to prepare proficiency testing samples that are closer to the actual samples and have good homogeneity and stability,and the ability of national laboratories to detect procymidone,carbofuran,and parathion in vegetables was analyzed through proficiency testing.Methods The proficiency testing samples were prepared by adding the target standard solution to the vegetable juice that was sold in the market,and the uniformity and stability were tested.The assigned value and standard deviation of proficiency testing were obtained by robust statistics,and the z value was applied to evaluate the results submitted by the participating laboratories.Results The prepared samples were tested for homogeneity and stability,and met the proficiency testing requirements.The samples were applied to proficiency testing,and 94 laboratories participated nationwide,of which the laboratory satisfaction rate in the procymidone project was 84.5%;the laboratory satisfaction rate in the carbofuran project was 83.3%;the laboratory satisfaction rate in the parathion project was 89.6%.Conclusion The sample prepared by the preparation method in this study has favorable homogeneity and stability and can meet the requirements of the sample for proficiency testing.The statistical results of proficiency testing showed that the detection ability of procymidone,carbofuran,and parathion in vegetables used in participating laboratories was generally favorable.Through this capability verification activity,we gained an understanding of the testing level of laboratories in this field and achieved the expected results.